Furnace



Oct. 30, 1934. H. BLACKBURN FURNACE Filed April 15, 1954 llliiiiim III INVENTOR H. BLACKBURN ATTORNEY Patented Oct. 30, 1934 FURNACE Henry Blackburn, Hull, Quebcc,-Canada Application April 13, 1934,"Seria'l No. 720,463

3 Claims.

My invention relates to hot water furnaces of the type adapted to be fired with liquid fuel and especially suited to the present day fuel oil burner.

The main object of my invention is to provide a furnace which will render the greatest efliciency when fired with fuel oil, by departing from the conventional furnace intended tobe fired with solid fuel, thereby doing away with the'conventional grates-grate-support, ash pit, etc.

Another object-is to provide a'furnace of the above mentioned type wherein the area in which the most intensive heat provided. by the oil burner is completely surrounded by water, thereby ab- 'sorbing agreatamount of heat resulting in a smaller furnace for a given hot water demand, as compared with an oil burner equipped furnace of other types.

A further object is to provide a furnace of the above-mentioned type which is neat in appearance, compact, and easily manufactured at low cost.

I arrive at the above and other objects by the construction of a furnace embodying an inner shell surrounded by a jacket spaced therefrom, providing room for water between the two, as shown in the appended drawing, in which,

Fig. 1 is a front elevation of the furnace; Fig. 2 is a longitudinal sectional elevation thereof;

Fig. 3 is a top view thereof; and

Fig. l is a cross-section thereof taken on line 4-4 of Fig. 2, showing the approximate location of the oil burner nozzle.

The furnace includes vertically disposed closed. top and bottom inner and outer drums 5, 9 respectively. The drum 5 is suspended in and arranged in spaced relation to the drum 9 to form a water circulating space entirely surrounding it. The top of drum 5 is designated 6, and the top and bottom of drum 9 are indicated 10, 11 respectively.

The drum 5 is an integral unit preferably of circular cross section and at a point between its transverse median and its bottom is formed with an inwardly extending restricted part 7. That portion of drum 5 below the part 7 is of bowl shaped contour that is substantially oval in vertical section. The part 7 provides the body of drum 5 with an upper and a lower chamber opening into each other and with the former of greater height and volume than that of the latter.

The drum 9 in proximity to its bottom is formed with a water inlet opening 12, which registers with a flanged connection employed for attaching a water supply line (not shown) with the said drum. The top 10 of drum 9 is provided with a [ranged below and extends water outlet opening 14 which registers with a flanged connection 15 used for attaching a water conducting off line (not shown) therewith.

'The burnt gases and smoke are lead to a stack by means'of a tubular member 16 located at the topof the inner drum and substantially at the top of the outer drum, passing through both, as shown, and suitably welded or otherwise mounted so as to-prevent any leakage from the jacket. Anchored at its ends to the drums 5, 6 is a radially disposed tubular member 17 opening into drum 5 and into the atmosphere. The member 17 is arin an opposite direction with respect to member 16. The member 17 provides a passage affording means whereby the furnace may be cleaned or otherwise attended. to. The outer end of member 17 is normally closed by a door 18. A radially disposed tubular member 19 is anchored to the lower portion of the drums 5, 9 which provides a passage from the outside drum to the bowl-like portion of the inner drum for the admission of the burner nozzle 20 into the bowl like portion 8 of the inner drum, as shown in Figs. 2 and 4. The members 16, 17 and 19 suspend the drum 5 within the drum 9.

While it is preferable to build a furnace of circular form, especially the bowl-like portion of the inner shell, the outside shell may be square or of other configuration, if desired.

In operation this furnace is installed by connecting flange 13 with the return or cold water end of the system, and flange 15 with the distributing header. A suitable oil burner is provided, the nozzle entering through the member 19 and reaching towards the centre of the bowlshaped portion and fired in the usual way. Owing to the fact that the heat generated by the burner is somewhat enclosed in to the bowlshaped portion, the water therearound will be subjected to intensive heat resulting in rapid and efficient circulation. The hot gases emerging through the opening bordered by 7, will heat the water between the two drums and finally heat the water above the top 6, constituting the equivalent to a regular furnace section.

It will be readily appreciated that the construction I have described is very simple and does away with a number of parts found in the ordinary furnace.

Furthermore, drum 5 as an integral unit formed in a special manner combines the necessary requirements of a fire-pot and distributor of heat to the medium circulating between drums 5 and 9.

While I have described my invention strictly in accordance with the embodiment shown, it must be understood that changes may be made to suit various requirements without departing from the spirit of the invention and scope of the following claims.

What I claim is:

1. In a water heating furnace of the liquid fuel type, a vertically disposed outer drum, a vertically disposed one-piece inner drum encompassed in spaced relation by said other drum and forming in connection with the latter a water heating space entirely surrounding it, a plurality of radially tubular superposed elements anchored to said drums for suspending the inner drum within the said outer drum, said elements opening into said inner drum, said inner drum'between its transverse median and lower end being formed with an inwardly extending restricted part to provide a pair of superposed communicating chambers of like greatest diameter and to form the lower portion of the inner drum of bowl-like contour, and the lower one of said elements providing a passage for the entrance of a burner into the lower one of said chambers; the upper one of said elements providing an outlet for the upper one of said chambers, and said outer drum being formed with an intake and an outlet for said water space.

2. In a water heating furnace, vertically disposed inner and outer drums arranged concentrically to each other in spaced relation to provide a water heating space, said inner drum, intermediate its ends being formed with a restricted part to provide a pair of superposed communicating chambers permanently opening into each other, the side wall of the lower of said chambers being of oval contour in vertical section, a connection between said drums providing a passage for the extension into the lower chamber of a fuel burner, a connection between said drums to provide an outlet for the upper chamber, said outer drum having spaced means providing a water intake and a water outlet for said space, and the said chambers being of the same greatest diameter.

3. In a water heating furnace vertically disposed inner and outer drums arranged concentrically in spaced relation to each other to provide a water heating space entirely surrounding said inner drum, said inner drum, intermediate its ends formed with an inwardly extending restricted part to provide the inner drum with a pair of superposed chambers permanently opening into each other, the lower of said chainbers providing a fire pot, the upper of said chambers being of greater height and Volume than that of said lower chamber to provide the greatest practical amount of heating surface against which the products of combustion and flame from the lower compartment will play, a connection between said drums providing a passage for the extension into the lower chamber of a fuel burner, a connection between said drums providing an outlet for the upper chamber, and said outer drum having spaced means providing a water intake and a water outlet for said space.

HENRY, BLACKBURN. 

